ISOPODS OF NORTH AMERICA. 



123 



not produced at its inner angle. Both branches are furnished with 

 spines. 



Onty the first pair of legs are prehensile. All the others, from the 

 second to the seventh inclusive, are ambulatory. The propodus of the 

 first pair of legs is furnished with three spines; the carpus with one 

 and the merus with one. 



FIG. 106. ClROLANIDES TEXENSIS. a, FlKST LEG. 6, SECOND LEG. C, FOURTH LEG. d, SEVENTH LEG. 



e, UHOPOD. 

 22. Genus EURYDICE Leach. 



The peduncle of the second pair of antennae is composed of four 

 articles. 



The first pair of antennae have the basal article of the peduncle 

 extended straight in front at right angles to remaining part of antenna. 



The plate of the second article of the maxillipeds is not furnished 

 with hooks. 



The abdomen has all six segments distinct. 



The first and second pairs of pleopods are subequal in structure; the 

 peduncle is very little or scarcely any wider than long; both branches 

 are submembranaceous, the posterior margin being furnished with very 

 long plumose hairs. 



The peduncle of the uropoda has the inner posterior angle very little 

 produced. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS EURYDICE. 



a. Terminal abdominal segment rounded posteriorly between the post-lateral tri- 

 angular teeth. Posterior margin between the lateral teeth denticulate, a spine 



alternating with each tooth Eurydice convexa Richardson 



a x . Terminal abdominal segment not rounded posteriorly. 



b. Terminal abdominal segment truncate between the triangular lateral teeth and 

 furnished with four long spines on the posterior margin. 



Eurydice caudata Richardson 



b'. Terminal abdominal segment widely emarginate in the middle between the 

 truncate post-lateral angles, each angle being furnished with two robust 

 spines Eurydice spinigera Hansen 



